Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 28,907	$ 19,500
Accumulated Amortization	7,335	6,117
Net	21,572	13,383
Amortization included in general and administrative expense	1,232	876	$ 680
Future amortization expense [Abstract]
2016	1,400
2017	1,400
2018	1,400
2019	1,400
2020	1,400
Proprietary Know-How [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,208	4,208
Accumulated Amortization	2,555	2,208
Net	1,653	2,000
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,950	5,944
Accumulated Amortization	0	0
Net	5,950	5,944
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	3,309
Accumulated Amortization	83
Net	3,226
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,694	5,694
Accumulated Amortization	3,165	2,895
Net	2,529	2,799
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,599	2,375
Accumulated Amortization	1,171	903
Net	1,428	1,472
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	7,147	1,279
Accumulated Amortization	361	111
Net	$ 6,786	$ 1,168